> For the complete documentation index, see [llms.txt](https://docs-beta.flex83.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-beta.flex83.com/table-of-contents/transformations/notebooks.md).

# Notebooks

This module provides a playground to the users who want to write their own code for ETL pipeline or any other purpose. In a notebook there can be multiple code blocks in which user can write his code and that can run/execute independently to solve a purpose. Following are the main features that are available under this module.

1. Write your own code.
2. Multiple languages support.
3. ETL pipeline (Stream/Batch).
4. Code Snippets for periodic execution.
5. Scheduler (CRON Jobs).

To create a **Notebook** go to **Bigdata > Notebooks** and click on **Add New**, fill in the basic details - Name & description then click on Next button.

![BigData > Notebooks > Add New](/files/-Mj-C3xFw2dgMouT9FrS)

To write your code snippets click on **Add New CodeBlock**. Configure the details - language, ETL, type, sample code; of code block according to your use case and proceed with the coding.

In this example, we will read data from MongoDB collection using Apache Spark SQL in Scala.

![BigData > Notebooks > Create > MongoDB Read](/files/-Mj-C3xGL7-rnSbc3sLy)

Click on save button after writing the code and click on *\*Run* button available in actions of codeblock and then debug button to see the output of the code written.

![BigData > Notebooks > Create > MongoDB Read > Debug](/files/-Mj-C3xHam_LZuk_2O3H)

Once you are satisfied with the code and its output then save the code block and save the notebook for future access.

Also you can schedule the execution of a code block. All you need to do is click on the **Schedule** button available in actions of code block then define the scheduler details - Hourly, Daily or Custom Cron expression, click on Save button.

![BigData > Notebooks > CodeBlock > Schedule](/files/-Mj-C3xIZSd--R0R_DK9)

Then to enable the configured scheduler click on green play button i.e. **Schedule Job** button in the top left side of code block. Once this is enabled then the code block will start to execute periodically according to defined scheduler.

![BigData > Notebooks > CodeBlock > Scheduler > Enable](/files/-Mj-C3xJzAHzwEeKPYnN)


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